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62 lines
2.1 KiB
Python
62 lines
2.1 KiB
Python
import time
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from autobahn.twisted.websocket import (
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WebSocketServerFactory, WebSocketServerProtocol,
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)
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from twisted.internet import reactor
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from .websocket_autobahn import get_factory, get_protocol
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class WebsocketTwistedInterface(object):
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"""
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Easy API to run a WebSocket interface server using Twisted.
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Integrates the channel backend by running it in a separate thread, using
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the always-compatible polling style.
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"""
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def __init__(self, channel_backend, port=9000):
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self.channel_backend = channel_backend
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self.port = port
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def run(self):
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self.factory = get_factory(WebSocketServerFactory)(debug=False)
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self.factory.protocol = get_protocol(WebSocketServerProtocol)
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reactor.listenTCP(self.port, self.factory)
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reactor.callInThread(self.backend_reader)
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reactor.callLater(1, self.keepalive_sender)
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reactor.run()
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def backend_reader(self):
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"""
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Run in a separate thread; reads messages from the backend.
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"""
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while True:
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channels = self.factory.reply_channels()
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# Quit if reactor is stopping
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if not reactor.running:
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return
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# Don't do anything if there's no channels to listen on
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if channels:
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channel, message = self.channel_backend.receive_many(channels)
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else:
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time.sleep(0.1)
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continue
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# Wait around if there's nothing received
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if channel is None:
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time.sleep(0.05)
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continue
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# Deal with the message
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self.factory.dispatch_send(channel, message)
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def keepalive_sender(self):
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"""
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Sends keepalive messages for open WebSockets every
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(channel_backend expiry / 2) seconds.
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"""
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expiry_window = int(self.channel_backend.expiry / 2)
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for protocol in self.factory.reply_protocols.values():
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if time.time() - protocol.last_keepalive > expiry_window:
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protocol.sendKeepalive()
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reactor.callLater(1, self.keepalive_sender)
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